*
* This file contains the Generic Target Engine Core.
*
- * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
- * Copyright (c) 2005, 2006, 2007 SBE, Inc.
- * Copyright (c) 2007-2010 Rising Tide Systems
- * Copyright (c) 2008-2010 Linux-iSCSI.org
+ * (c) Copyright 2002-2012 RisingTide Systems LLC.
*
* Nicholas A. Bellinger <nab@kernel.org>
*
static int transport_generic_get_mem(struct se_cmd *cmd);
static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
static void transport_put_cmd(struct se_cmd *cmd);
-static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
static void target_complete_ok_work(struct work_struct *work);
int init_se_kmem_caches(void)
}
EXPORT_SYMBOL(transport_register_session);
-void target_release_session(struct kref *kref)
+static void target_release_session(struct kref *kref)
{
struct se_session *se_sess = container_of(kref,
struct se_session, sess_kref);
{
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
- transport_generic_request_failure(cmd);
+ transport_generic_request_failure(cmd,
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
}
/*
complete(&cmd->t_transport_stop_comp);
return;
} else if (cmd->transport_state & CMD_T_FAILED) {
- cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
INIT_WORK(&cmd->work, target_complete_failure_work);
} else {
INIT_WORK(&cmd->work, target_complete_ok_work);
static void transport_write_pending_qf(struct se_cmd *cmd);
static void transport_complete_qf(struct se_cmd *cmd);
-static void target_qf_do_work(struct work_struct *work)
+void target_qf_do_work(struct work_struct *work)
{
struct se_device *dev = container_of(work, struct se_device,
qf_work_queue);
int *bl)
{
*bl += sprintf(b + *bl, "Status: ");
- switch (dev->dev_status) {
- case TRANSPORT_DEVICE_ACTIVATED:
+ if (dev->export_count)
*bl += sprintf(b + *bl, "ACTIVATED");
- break;
- case TRANSPORT_DEVICE_DEACTIVATED:
+ else
*bl += sprintf(b + *bl, "DEACTIVATED");
- break;
- case TRANSPORT_DEVICE_SHUTDOWN:
- *bl += sprintf(b + *bl, "SHUTDOWN");
- break;
- case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
- case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
- *bl += sprintf(b + *bl, "OFFLINE");
- break;
- default:
- *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
- break;
- }
*bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
*bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
- dev->se_sub_dev->se_dev_attrib.block_size,
- dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
+ dev->dev_attrib.block_size,
+ dev->dev_attrib.hw_max_sectors);
*bl += sprintf(b + *bl, " ");
}
}
EXPORT_SYMBOL(transport_set_vpd_ident);
-static void core_setup_task_attr_emulation(struct se_device *dev)
-{
- /*
- * If this device is from Target_Core_Mod/pSCSI, disable the
- * SAM Task Attribute emulation.
- *
- * This is currently not available in upsream Linux/SCSI Target
- * mode code, and is assumed to be disabled while using TCM/pSCSI.
- */
- if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
- dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
- return;
- }
-
- dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
- pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
- " device\n", dev->transport->name,
- dev->transport->get_device_rev(dev));
-}
-
-static void scsi_dump_inquiry(struct se_device *dev)
-{
- struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
- char buf[17];
- int i, device_type;
- /*
- * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
- */
- for (i = 0; i < 8; i++)
- if (wwn->vendor[i] >= 0x20)
- buf[i] = wwn->vendor[i];
- else
- buf[i] = ' ';
- buf[i] = '\0';
- pr_debug(" Vendor: %s\n", buf);
-
- for (i = 0; i < 16; i++)
- if (wwn->model[i] >= 0x20)
- buf[i] = wwn->model[i];
- else
- buf[i] = ' ';
- buf[i] = '\0';
- pr_debug(" Model: %s\n", buf);
-
- for (i = 0; i < 4; i++)
- if (wwn->revision[i] >= 0x20)
- buf[i] = wwn->revision[i];
- else
- buf[i] = ' ';
- buf[i] = '\0';
- pr_debug(" Revision: %s\n", buf);
-
- device_type = dev->transport->get_device_type(dev);
- pr_debug(" Type: %s ", scsi_device_type(device_type));
- pr_debug(" ANSI SCSI revision: %02x\n",
- dev->transport->get_device_rev(dev));
-}
-
-struct se_device *transport_add_device_to_core_hba(
- struct se_hba *hba,
- struct se_subsystem_api *transport,
- struct se_subsystem_dev *se_dev,
- u32 device_flags,
- void *transport_dev,
- struct se_dev_limits *dev_limits,
- const char *inquiry_prod,
- const char *inquiry_rev)
-{
- int force_pt;
- struct se_device *dev;
-
- dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
- if (!dev) {
- pr_err("Unable to allocate memory for se_dev_t\n");
- return NULL;
- }
-
- dev->dev_flags = device_flags;
- dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
- dev->dev_ptr = transport_dev;
- dev->se_hba = hba;
- dev->se_sub_dev = se_dev;
- dev->transport = transport;
- INIT_LIST_HEAD(&dev->dev_list);
- INIT_LIST_HEAD(&dev->dev_sep_list);
- INIT_LIST_HEAD(&dev->dev_tmr_list);
- INIT_LIST_HEAD(&dev->delayed_cmd_list);
- INIT_LIST_HEAD(&dev->state_list);
- INIT_LIST_HEAD(&dev->qf_cmd_list);
- spin_lock_init(&dev->execute_task_lock);
- spin_lock_init(&dev->delayed_cmd_lock);
- spin_lock_init(&dev->dev_reservation_lock);
- spin_lock_init(&dev->dev_status_lock);
- spin_lock_init(&dev->se_port_lock);
- spin_lock_init(&dev->se_tmr_lock);
- spin_lock_init(&dev->qf_cmd_lock);
- atomic_set(&dev->dev_ordered_id, 0);
-
- se_dev_set_default_attribs(dev, dev_limits);
-
- dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
- dev->creation_time = get_jiffies_64();
- spin_lock_init(&dev->stats_lock);
-
- spin_lock(&hba->device_lock);
- list_add_tail(&dev->dev_list, &hba->hba_dev_list);
- hba->dev_count++;
- spin_unlock(&hba->device_lock);
- /*
- * Setup the SAM Task Attribute emulation for struct se_device
- */
- core_setup_task_attr_emulation(dev);
- /*
- * Force PR and ALUA passthrough emulation with internal object use.
- */
- force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
- /*
- * Setup the Reservations infrastructure for struct se_device
- */
- core_setup_reservations(dev, force_pt);
- /*
- * Setup the Asymmetric Logical Unit Assignment for struct se_device
- */
- if (core_setup_alua(dev, force_pt) < 0)
- goto err_dev_list;
-
- /*
- * Startup the struct se_device processing thread
- */
- dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
- dev->transport->name);
- if (!dev->tmr_wq) {
- pr_err("Unable to create tmr workqueue for %s\n",
- dev->transport->name);
- goto err_dev_list;
- }
- /*
- * Setup work_queue for QUEUE_FULL
- */
- INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
- /*
- * Preload the initial INQUIRY const values if we are doing
- * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
- * passthrough because this is being provided by the backend LLD.
- * This is required so that transport_get_inquiry() copies these
- * originals once back into DEV_T10_WWN(dev) for the virtual device
- * setup.
- */
- if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
- if (!inquiry_prod || !inquiry_rev) {
- pr_err("All non TCM/pSCSI plugins require"
- " INQUIRY consts\n");
- goto err_wq;
- }
-
- strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
- strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
- strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
- }
- scsi_dump_inquiry(dev);
-
- return dev;
-
-err_wq:
- destroy_workqueue(dev->tmr_wq);
-err_dev_list:
- spin_lock(&hba->device_lock);
- list_del(&dev->dev_list);
- hba->dev_count--;
- spin_unlock(&hba->device_lock);
-
- se_release_vpd_for_dev(dev);
-
- kfree(dev);
-
- return NULL;
-}
-EXPORT_SYMBOL(transport_add_device_to_core_hba);
-
-int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
+sense_reason_t
+target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
{
struct se_device *dev = cmd->se_dev;
if (cmd->data_direction == DMA_TO_DEVICE) {
pr_err("Rejecting underflow/overflow"
" WRITE data\n");
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
}
/*
* Reject READ_* or WRITE_* with overflow/underflow for
* type SCF_SCSI_DATA_CDB.
*/
- if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
+ if (dev->dev_attrib.block_size != 512) {
pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
" CDB on non 512-byte sector setup subsystem"
" plugin: %s\n", dev->transport->name);
/* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
}
/*
* For the overflow case keep the existing fabric provided
return 0;
-out_invalid_cdb_field:
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
- return -EINVAL;
}
/*
}
EXPORT_SYMBOL(transport_init_se_cmd);
-static int transport_check_alloc_task_attr(struct se_cmd *cmd)
+static sense_reason_t
+transport_check_alloc_task_attr(struct se_cmd *cmd)
{
+ struct se_device *dev = cmd->se_dev;
+
/*
* Check if SAM Task Attribute emulation is enabled for this
* struct se_device storage object
*/
- if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
+ if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
return 0;
if (cmd->sam_task_attr == MSG_ACA_TAG) {
pr_debug("SAM Task Attribute ACA"
" emulation is not supported\n");
- return -EINVAL;
+ return TCM_INVALID_CDB_FIELD;
}
/*
* Used to determine when ORDERED commands should go from
* Dormant to Active status.
*/
- cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
+ cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
smp_mb__after_atomic_inc();
pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
cmd->se_ordered_id, cmd->sam_task_attr,
- cmd->se_dev->transport->name);
+ dev->transport->name);
return 0;
}
-/* target_setup_cmd_from_cdb():
- *
- * Called from fabric RX Thread.
- */
-int target_setup_cmd_from_cdb(
- struct se_cmd *cmd,
- unsigned char *cdb)
+sense_reason_t
+target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
{
- struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
- u32 pr_reg_type = 0;
- u8 alua_ascq = 0;
+ struct se_device *dev = cmd->se_dev;
unsigned long flags;
- int ret;
+ sense_reason_t ret;
/*
* Ensure that the received CDB is less than the max (252 + 8) bytes
pr_err("Received SCSI CDB with command_size: %d that"
" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
- return -EINVAL;
+ return TCM_INVALID_CDB_FIELD;
}
/*
* If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
" %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
scsi_command_size(cdb),
(unsigned long)sizeof(cmd->__t_task_cdb));
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason =
- TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- return -ENOMEM;
+ return TCM_OUT_OF_RESOURCES;
}
} else
cmd->t_task_cdb = &cmd->__t_task_cdb[0];
/*
* Check for an existing UNIT ATTENTION condition
*/
- if (core_scsi3_ua_check(cmd, cdb) < 0) {
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
- return -EINVAL;
- }
+ ret = target_scsi3_ua_check(cmd);
+ if (ret)
+ return ret;
- ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
- if (ret != 0) {
- /*
- * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
- * The ALUA additional sense code qualifier (ASCQ) is determined
- * by the ALUA primary or secondary access state..
- */
- if (ret > 0) {
- pr_debug("[%s]: ALUA TG Port not available, "
- "SenseKey: NOT_READY, ASC/ASCQ: "
- "0x04/0x%02x\n",
- cmd->se_tfo->get_fabric_name(), alua_ascq);
-
- transport_set_sense_codes(cmd, 0x04, alua_ascq);
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
- return -EINVAL;
- }
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
- return -EINVAL;
- }
+ ret = target_alua_state_check(cmd);
+ if (ret)
+ return ret;
- /*
- * Check status for SPC-3 Persistent Reservations
- */
- if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
- if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
- cmd, cdb, pr_reg_type) != 0) {
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
- cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
- cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
- return -EBUSY;
- }
- /*
- * This means the CDB is allowed for the SCSI Initiator port
- * when said port is *NOT* holding the legacy SPC-2 or
- * SPC-3 Persistent Reservation.
- */
- }
+ ret = target_check_reservation(cmd);
+ if (ret)
+ return ret;
- ret = cmd->se_dev->transport->parse_cdb(cmd);
- if (ret < 0)
+ ret = dev->transport->parse_cdb(cmd);
+ if (ret)
+ return ret;
+
+ ret = transport_check_alloc_task_attr(cmd);
+ if (ret)
return ret;
spin_lock_irqsave(&cmd->t_state_lock, flags);
cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- /*
- * Check for SAM Task Attribute Emulation
- */
- if (transport_check_alloc_task_attr(cmd) < 0) {
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
- return -EINVAL;
- }
spin_lock(&cmd->se_lun->lun_sep_lock);
if (cmd->se_lun->lun_sep)
cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
int transport_handle_cdb_direct(
struct se_cmd *cmd)
{
- int ret;
+ sense_reason_t ret;
if (!cmd->se_lun) {
dump_stack();
* and call transport_generic_request_failure() if necessary..
*/
ret = transport_generic_new_cmd(cmd);
- if (ret < 0)
- transport_generic_request_failure(cmd);
-
+ if (ret)
+ transport_generic_request_failure(cmd, ret);
return 0;
}
EXPORT_SYMBOL(transport_handle_cdb_direct);
+static sense_reason_t
+transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
+ u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
+{
+ if (!sgl || !sgl_count)
+ return 0;
+
+ /*
+ * Reject SCSI data overflow with map_mem_to_cmd() as incoming
+ * scatterlists already have been set to follow what the fabric
+ * passes for the original expected data transfer length.
+ */
+ if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
+ pr_warn("Rejecting SCSI DATA overflow for fabric using"
+ " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
+ return TCM_INVALID_CDB_FIELD;
+ }
+
+ cmd->t_data_sg = sgl;
+ cmd->t_data_nents = sgl_count;
+
+ if (sgl_bidi && sgl_bidi_count) {
+ cmd->t_bidi_data_sg = sgl_bidi;
+ cmd->t_bidi_data_nents = sgl_bidi_count;
+ }
+ cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
+ return 0;
+}
+
/*
* target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
* se_cmd + use pre-allocated SGL memory.
struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
{
struct se_portal_group *se_tpg;
- int rc;
+ sense_reason_t rc;
+ int ret;
se_tpg = se_sess->se_tpg;
BUG_ON(!se_tpg);
* for fabrics using TARGET_SCF_ACK_KREF that expect a second
* kref_put() to happen during fabric packet acknowledgement.
*/
- rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
- if (rc)
- return rc;
+ ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
+ if (ret)
+ return ret;
/*
* Signal bidirectional data payloads to target-core
*/
/*
* Locate se_lun pointer and attach it to struct se_cmd
*/
- if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
- transport_send_check_condition_and_sense(se_cmd,
- se_cmd->scsi_sense_reason, 0);
+ rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
+ if (rc) {
+ transport_send_check_condition_and_sense(se_cmd, rc, 0);
target_put_sess_cmd(se_sess, se_cmd);
return 0;
}
rc = target_setup_cmd_from_cdb(se_cmd, cdb);
if (rc != 0) {
- transport_generic_request_failure(se_cmd);
+ transport_generic_request_failure(se_cmd, rc);
return 0;
}
/*
rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
sgl_bidi, sgl_bidi_count);
if (rc != 0) {
- transport_generic_request_failure(se_cmd);
+ transport_generic_request_failure(se_cmd, rc);
return 0;
}
}
/*
* Handle SAM-esque emulation for generic transport request failures.
*/
-void transport_generic_request_failure(struct se_cmd *cmd)
+void transport_generic_request_failure(struct se_cmd *cmd,
+ sense_reason_t sense_reason)
{
int ret = 0;
pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
" CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
cmd->t_task_cdb[0]);
- pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
+ pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
cmd->se_tfo->get_cmd_state(cmd),
- cmd->t_state, cmd->scsi_sense_reason);
+ cmd->t_state, sense_reason);
pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
(cmd->transport_state & CMD_T_ACTIVE) != 0,
(cmd->transport_state & CMD_T_STOP) != 0,
/*
* For SAM Task Attribute emulation for failed struct se_cmd
*/
- if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
- transport_complete_task_attr(cmd);
+ transport_complete_task_attr(cmd);
- switch (cmd->scsi_sense_reason) {
+ switch (sense_reason) {
case TCM_NON_EXISTENT_LUN:
case TCM_UNSUPPORTED_SCSI_OPCODE:
case TCM_INVALID_CDB_FIELD:
case TCM_CHECK_CONDITION_UNIT_ATTENTION:
case TCM_CHECK_CONDITION_NOT_READY:
break;
+ case TCM_OUT_OF_RESOURCES:
+ sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ break;
case TCM_RESERVATION_CONFLICT:
/*
* No SENSE Data payload for this case, set SCSI Status
* See spc4r17, section 7.4.6 Control Mode Page, Table 349
*/
if (cmd->se_sess &&
- cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
+ cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
cmd->orig_fe_lun, 0x2C,
ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
goto check_stop;
default:
pr_err("Unknown transport error for CDB 0x%02x: %d\n",
- cmd->t_task_cdb[0], cmd->scsi_sense_reason);
- cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+ cmd->t_task_cdb[0], sense_reason);
+ sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
break;
}
- ret = transport_send_check_condition_and_sense(cmd,
- cmd->scsi_sense_reason, 0);
+ ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
static void __target_execute_cmd(struct se_cmd *cmd)
{
- int error = 0;
+ sense_reason_t ret;
spin_lock_irq(&cmd->t_state_lock);
cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
spin_unlock_irq(&cmd->t_state_lock);
- if (cmd->execute_cmd)
- error = cmd->execute_cmd(cmd);
+ if (cmd->execute_cmd) {
+ ret = cmd->execute_cmd(cmd);
+ if (ret) {
+ spin_lock_irq(&cmd->t_state_lock);
+ cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
+ spin_unlock_irq(&cmd->t_state_lock);
- if (error) {
- spin_lock_irq(&cmd->t_state_lock);
- cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
- spin_unlock_irq(&cmd->t_state_lock);
-
- transport_generic_request_failure(cmd);
+ transport_generic_request_failure(cmd, ret);
+ }
}
}
-void target_execute_cmd(struct se_cmd *cmd)
+static bool target_handle_task_attr(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
- /*
- * If the received CDB has aleady been aborted stop processing it here.
- */
- if (transport_check_aborted_status(cmd, 1)) {
- complete(&cmd->t_transport_stop_comp);
- return;
- }
-
- /*
- * Determine if IOCTL context caller in requesting the stopping of this
- * command for LUN shutdown purposes.
- */
- spin_lock_irq(&cmd->t_state_lock);
- if (cmd->transport_state & CMD_T_LUN_STOP) {
- pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
- __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
-
- cmd->transport_state &= ~CMD_T_ACTIVE;
- spin_unlock_irq(&cmd->t_state_lock);
- complete(&cmd->transport_lun_stop_comp);
- return;
- }
- /*
- * Determine if frontend context caller is requesting the stopping of
- * this command for frontend exceptions.
- */
- if (cmd->transport_state & CMD_T_STOP) {
- pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
- __func__, __LINE__,
- cmd->se_tfo->get_task_tag(cmd));
-
- spin_unlock_irq(&cmd->t_state_lock);
- complete(&cmd->t_transport_stop_comp);
- return;
- }
-
- cmd->t_state = TRANSPORT_PROCESSING;
- spin_unlock_irq(&cmd->t_state_lock);
-
- if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
- goto execute;
+ if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
+ return false;
/*
* Check for the existence of HEAD_OF_QUEUE, and if true return 1
pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
"se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->se_ordered_id);
- goto execute;
+ return false;
case MSG_ORDERED_TAG:
atomic_inc(&dev->dev_ordered_sync);
smp_mb__after_atomic_inc();
* exist that need to be completed first.
*/
if (!atomic_read(&dev->simple_cmds))
- goto execute;
+ return false;
break;
default:
/*
break;
}
- if (atomic_read(&dev->dev_ordered_sync) != 0) {
- spin_lock(&dev->delayed_cmd_lock);
- list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
- spin_unlock(&dev->delayed_cmd_lock);
+ if (atomic_read(&dev->dev_ordered_sync) == 0)
+ return false;
- pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
- " delayed CMD list, se_ordered_id: %u\n",
- cmd->t_task_cdb[0], cmd->sam_task_attr,
- cmd->se_ordered_id);
+ spin_lock(&dev->delayed_cmd_lock);
+ list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
+ spin_unlock(&dev->delayed_cmd_lock);
+
+ pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
+ " delayed CMD list, se_ordered_id: %u\n",
+ cmd->t_task_cdb[0], cmd->sam_task_attr,
+ cmd->se_ordered_id);
+ return true;
+}
+
+void target_execute_cmd(struct se_cmd *cmd)
+{
+ /*
+ * If the received CDB has aleady been aborted stop processing it here.
+ */
+ if (transport_check_aborted_status(cmd, 1)) {
+ complete(&cmd->transport_lun_stop_comp);
return;
}
-execute:
/*
- * Otherwise, no ORDERED task attributes exist..
+ * Determine if IOCTL context caller in requesting the stopping of this
+ * command for LUN shutdown purposes.
*/
- __target_execute_cmd(cmd);
+ spin_lock_irq(&cmd->t_state_lock);
+ if (cmd->transport_state & CMD_T_LUN_STOP) {
+ pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
+ __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
+
+ cmd->transport_state &= ~CMD_T_ACTIVE;
+ spin_unlock_irq(&cmd->t_state_lock);
+ complete(&cmd->transport_lun_stop_comp);
+ return;
+ }
+ /*
+ * Determine if frontend context caller is requesting the stopping of
+ * this command for frontend exceptions.
+ */
+ if (cmd->transport_state & CMD_T_STOP) {
+ pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
+ __func__, __LINE__,
+ cmd->se_tfo->get_task_tag(cmd));
+
+ spin_unlock_irq(&cmd->t_state_lock);
+ complete(&cmd->t_transport_stop_comp);
+ return;
+ }
+
+ cmd->t_state = TRANSPORT_PROCESSING;
+ spin_unlock_irq(&cmd->t_state_lock);
+
+ if (!target_handle_task_attr(cmd))
+ __target_execute_cmd(cmd);
}
EXPORT_SYMBOL(target_execute_cmd);
{
struct se_device *dev = cmd->se_dev;
+ if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
+ return;
+
if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
atomic_dec(&dev->simple_cmds);
smp_mb__after_atomic_dec();
{
int ret = 0;
- if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
- transport_complete_task_attr(cmd);
+ transport_complete_task_attr(cmd);
if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
ret = cmd->se_tfo->queue_status(cmd);
* delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
* Attribute.
*/
- if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
- transport_complete_task_attr(cmd);
+ transport_complete_task_attr(cmd);
+
/*
* Check to schedule QUEUE_FULL work, or execute an existing
* cmd->transport_qf_callback()
unsigned long flags;
spin_lock_irqsave(&cmd->t_state_lock, flags);
- if (atomic_read(&cmd->t_fe_count)) {
- if (!atomic_dec_and_test(&cmd->t_fe_count))
- goto out_busy;
+ if (atomic_read(&cmd->t_fe_count) &&
+ !atomic_dec_and_test(&cmd->t_fe_count)) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ return;
}
if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
transport_free_pages(cmd);
transport_release_cmd(cmd);
return;
-out_busy:
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-}
-
-/*
- * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
- * allocating in the core.
- * @cmd: Associated se_cmd descriptor
- * @mem: SGL style memory for TCM WRITE / READ
- * @sg_mem_num: Number of SGL elements
- * @mem_bidi_in: SGL style memory for TCM BIDI READ
- * @sg_mem_bidi_num: Number of BIDI READ SGL elements
- *
- * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
- * of parameters.
- */
-int transport_generic_map_mem_to_cmd(
- struct se_cmd *cmd,
- struct scatterlist *sgl,
- u32 sgl_count,
- struct scatterlist *sgl_bidi,
- u32 sgl_bidi_count)
-{
- if (!sgl || !sgl_count)
- return 0;
-
- /*
- * Reject SCSI data overflow with map_mem_to_cmd() as incoming
- * scatterlists already have been set to follow what the fabric
- * passes for the original expected data transfer length.
- */
- if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
- pr_warn("Rejecting SCSI DATA overflow for fabric using"
- " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
- return -EINVAL;
- }
-
- cmd->t_data_sg = sgl;
- cmd->t_data_nents = sgl_count;
-
- if (sgl_bidi && sgl_bidi_count) {
- cmd->t_bidi_data_sg = sgl_bidi;
- cmd->t_bidi_data_nents = sgl_bidi_count;
- }
- cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
- return 0;
}
-EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
void *transport_kmap_data_sg(struct se_cmd *cmd)
{
/* >1 page. use vmap */
pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
- if (!pages) {
- cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ if (!pages)
return NULL;
- }
/* convert sg[] to pages[] */
for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
kfree(pages);
- if (!cmd->t_data_vmap) {
- cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ if (!cmd->t_data_vmap)
return NULL;
- }
return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
}
* might not have the payload yet, so notify the fabric via a call to
* ->write_pending instead. Otherwise place it on the execution queue.
*/
-int transport_generic_new_cmd(struct se_cmd *cmd)
+sense_reason_t
+transport_generic_new_cmd(struct se_cmd *cmd)
{
int ret = 0;
cmd->data_length) {
ret = transport_generic_get_mem(cmd);
if (ret < 0)
- goto out_fail;
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
atomic_inc(&cmd->t_fe_count);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
- if (ret < 0)
- return ret;
- return 1;
+ /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
+ WARN_ON(ret);
+
+ return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-out_fail:
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- return -EINVAL;
queue_full:
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
return 0;
}
-static int transport_set_sense_codes(
- struct se_cmd *cmd,
- u8 asc,
- u8 ascq)
-{
- cmd->scsi_asc = asc;
- cmd->scsi_ascq = ascq;
-
- return 0;
-}
-
-int transport_send_check_condition_and_sense(
- struct se_cmd *cmd,
- u8 reason,
- int from_transport)
+int
+transport_send_check_condition_and_sense(struct se_cmd *cmd,
+ sense_reason_t reason, int from_transport)
{
unsigned char *buffer = cmd->sense_buffer;
unsigned long flags;
int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
{
- int ret = 0;
+ if (!(cmd->transport_state & CMD_T_ABORTED))
+ return 0;
- if (cmd->transport_state & CMD_T_ABORTED) {
- if (!send_status ||
- (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
- return 1;
+ if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
+ return 1;
- pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
- " status for CDB: 0x%02x ITT: 0x%08x\n",
- cmd->t_task_cdb[0],
- cmd->se_tfo->get_task_tag(cmd));
+ pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
+ cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
- cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
- cmd->se_tfo->queue_status(cmd);
- ret = 1;
- }
- return ret;
+ cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
+ cmd->se_tfo->queue_status(cmd);
+
+ return 1;
}
EXPORT_SYMBOL(transport_check_aborted_status);
projects / karo-tx-linux.git / blobdiff